I don't know how well the light works, but I'm not crazy about rubber band mounting which I've seen on other lights as well. One of the things I like about this Zefal light is that it not only has a quick on/off slide mount, the angle is also adjustable. That rubber band also surely has a finite lifespan.

I use the bike for short local hops - going to the gym, Walmart and always remove the light along with the seat. Very quick and simple with the slide mount.